/ˈletə(r) ||; ˈlɛtɚ/noun[C] 1 a written or printed message that you send to sb 信: I got a letter from Matthew this morning. 今天上午我收到马修的来信。I'm writing a thank-you letter to my uncle for the flowers he sent. 我叔叔给我送了花，我在给他写感谢信。
When you have written a letter you put it in an envelope, address it, put / stick a stamp on it and then post (US mail) it. You may forward a letter to a person who has moved away. 信写好了，放在信封(envelope)里，写上地址(address)，贴上(put／stick)邮票(stamp)，然后寄出（post，美国英语为mail）。要是收信人搬了家，你可以要求邮局把信转递(forward)给他。2 a written or printed sign that represents a sound in a language 字母: ‘Z’ is the last letter of the English alphabet. Z是英语字母表的最后一个字母。
Letters may be written or printed as capitals or small letters Is ‘east’ written with a capital or a small ‘e’? 手写或印刷体的大写字母叫做capital，小写字母叫做small letter：east这个词里的e是大写还是小写？